%0 Journal Article
%A Pascal Auscher
%A A. ter Elst
%A Derek Robinson
%T On positive Rockland operators
%J Colloquium Mathematicum
%D 1994
%P 197-216
%V 67
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-67-2-197-216/
%R 10.4064/cm-67-2-197-216
%G en
%F 10_4064_cm_67_2_197_216